[sol-cov] add ability to ignore covering specific code blocks

packages/sol-cov/src/ast_visitor.ts

@@ -23,8 +23,13 @@ export class ASTVisitor {
     private _modifiersStatementIds: number[] = [];
     private _statementMap: StatementMap = {};
     private _locationByOffset: LocationByOffset;
-    constructor(locationByOffset: LocationByOffset) {
+    private _ignoreRangesBeginningAt: number[];
+    // keep track of contract/function ranges that are to be ignored
+    // so we can also ignore any children nodes within the contract/function
+    private _ignoreRangesWithin: Array<[number, number]> = [];
+    constructor(locationByOffset: LocationByOffset, ignoreRangesBeginningAt: number[] = []) {
         this._locationByOffset = locationByOffset;
+        this._ignoreRangesBeginningAt = ignoreRangesBeginningAt;
     }
     public getCollectedCoverageEntries(): CoverageEntriesDescription {
         const coverageEntriesDescription = {
@@ -42,6 +47,11 @@ export class ASTVisitor {
     public FunctionDefinition(ast: Parser.FunctionDefinition): void {
         this._visitFunctionLikeDefinition(ast);
     }
+    public ContractDefinition(ast: Parser.ContractDefinition): void {
+        if (this._shouldIgnoreExpression(ast)) {
+            this._ignoreRangesWithin.push(ast.range as [number, number]);
+        }
+    }
     public ModifierDefinition(ast: Parser.ModifierDefinition): void {
         this._visitFunctionLikeDefinition(ast);
     }
@@ -96,6 +106,9 @@ export class ASTVisitor {
     public ModifierInvocation(ast: Parser.ModifierInvocation): void {
         const BUILTIN_MODIFIERS = ['public', 'view', 'payable', 'external', 'internal', 'pure', 'constant'];
         if (!_.includes(BUILTIN_MODIFIERS, ast.name)) {
+            if (this._shouldIgnoreExpression(ast)) {
+                return;
+            }
             this._modifiersStatementIds.push(this._entryId);
             this._visitStatement(ast);
         }
@@ -106,13 +119,19 @@ export class ASTVisitor {
         right: Parser.ASTNode,
         type: BranchType,
     ): void {
+        if (this._shouldIgnoreExpression(ast)) {
+            return;
+        }
         this._branchMap[this._entryId++] = {
             line: this._getExpressionRange(ast).start.line,
             type,
             locations: [this._getExpressionRange(left), this._getExpressionRange(right)],
         };
     }
     private _visitStatement(ast: Parser.ASTNode): void {
+        if (this._shouldIgnoreExpression(ast)) {
+            return;
+        }
         this._statementMap[this._entryId++] = this._getExpressionRange(ast);
     }
     private _getExpressionRange(ast: Parser.ASTNode): SingleFileSourceRange {
@@ -125,7 +144,19 @@ export class ASTVisitor {
         };
         return range;
     }
+    private _shouldIgnoreExpression(ast: Parser.ASTNode): boolean {
+        const [astStart, astEnd] = ast.range as [number, number];
+        const isRangeIgnored = _.some(
+            this._ignoreRangesWithin,
+            ([rangeStart, rangeEnd]: [number, number]) => astStart >= rangeStart && astEnd <= rangeEnd,
+        );
+        return this._ignoreRangesBeginningAt.includes(astStart) || isRangeIgnored;
+    }
     private _visitFunctionLikeDefinition(ast: Parser.ModifierDefinition | Parser.FunctionDefinition): void {
+        if (this._shouldIgnoreExpression(ast)) {
+            this._ignoreRangesWithin.push(ast.range as [number, number]);
+            return;
+        }
         const loc = this._getExpressionRange(ast);
         this._fnMap[this._entryId++] = {
             name: ast.name,

packages/sol-cov/src/collect_coverage_entries.ts

@@ -5,6 +5,8 @@ import * as parser from 'solidity-parser-antlr';
 import { ASTVisitor, CoverageEntriesDescription } from './ast_visitor';
 import { getLocationByOffset } from './source_maps';
 
+const IGNORE_RE = /\/\*\s*solcov\s+ignore\s+next\s*\*\/\s*/gm;
+
 // Parsing source code for each transaction/code is slow and therefore we cache it
 const coverageEntriesBySourceHash: { [sourceHash: string]: CoverageEntriesDescription } = {};
 
@@ -13,10 +15,27 @@ export const collectCoverageEntries = (contractSource: string) => {
     if (_.isUndefined(coverageEntriesBySourceHash[sourceHash]) && !_.isUndefined(contractSource)) {
         const ast = parser.parse(contractSource, { range: true });
         const locationByOffset = getLocationByOffset(contractSource);
-        const visitor = new ASTVisitor(locationByOffset);
+        const ignoreRangesBegingingAt = gatherRangesToIgnore(contractSource);
+        const visitor = new ASTVisitor(locationByOffset, ignoreRangesBegingingAt);
         parser.visit(ast, visitor);
         coverageEntriesBySourceHash[sourceHash] = visitor.getCollectedCoverageEntries();
     }
     const coverageEntriesDescription = coverageEntriesBySourceHash[sourceHash];
     return coverageEntriesDescription;
 };
+
+// Gather the start index of all code blocks preceeded by "/* solcov ignore next */"
+function gatherRangesToIgnore(contractSource: string): number[] {
+    const ignoreRangesStart = [];
+
+    let match;
+    do {
+        match = IGNORE_RE.exec(contractSource);
+        if (match) {
+            const matchLen = match[0].length;
+            ignoreRangesStart.push(match.index + matchLen);
+        }
+    } while (match);
+
+    return ignoreRangesStart;
+}

packages/sol-cov/test/collect_coverage_entries_test.ts

@@ -121,5 +121,35 @@ describe('Collect coverage entries', () => {
             const branchTypes = _.map(branchDescriptions, branchDescription => branchDescription.type);
             expect(branchTypes).to.be.deep.equal(['if', 'if', 'if', 'if', 'binary-expr', 'if']);
         });
+
+        it('correctly ignores all coverage entries for Ignore contract', () => {
+            const solcovIgnoreContractBaseName = 'SolcovIgnore.sol';
+            const solcovIgnoreContractFileName = path.resolve(
+                __dirname,
+                'fixtures/contracts',
+                solcovIgnoreContractBaseName,
+            );
+            const solcovIgnoreContract = fs.readFileSync(solcovIgnoreContractFileName).toString();
+            const coverageEntries = collectCoverageEntries(solcovIgnoreContract);
+            const fnIds = _.keys(coverageEntries.fnMap);
+
+            expect(fnIds.length).to.be.equal(1);
+            expect(coverageEntries.fnMap[fnIds[0]].name).to.be.equal('set');
+            // tslint:disable-next-line:custom-no-magic-numbers
+            expect(coverageEntries.fnMap[fnIds[0]].line).to.be.equal(6);
+            const setFunction = `function set(uint x) public {
+        /* solcov ignore next */
+        storedData = x;
+    }`;
+            expect(utils.getRange(solcovIgnoreContract, coverageEntries.fnMap[fnIds[0]].loc)).to.be.equal(setFunction);
+
+            expect(coverageEntries.branchMap).to.be.deep.equal({});
+            const statementIds = _.keys(coverageEntries.statementMap);
+            expect(utils.getRange(solcovIgnoreContract, coverageEntries.statementMap[statementIds[0]])).to.be.equal(
+                setFunction,
+            );
+            expect(statementIds.length).to.be.equal(1);
+            expect(coverageEntries.modifiersStatementIds.length).to.be.equal(0);
+        });
     });
 });

packages/sol-cov/test/fixtures/contracts/SolcovIgnore.sol

@@ -0,0 +1,22 @@
+pragma solidity ^0.4.21;
+
+contract SolcovIgnore {
+    uint public storedData;
+
+    function set(uint x) public {
+        /* solcov ignore next */
+        storedData = x;
+    }
+
+    /* solcov ignore next */
+    function get() constant public returns (uint retVal) {
+        return storedData;
+    }
+}
+
+/* solcov ignore next */
+contract Ignore {
+    function ignored() public returns (bool) {
+        return false;
+    }
+}